Great advice has been posted about how to deal with the scratches. I believe that most Keystone products are constructed using plastic laminates pressed together under high pressure. For those laminates the company states, ".....are highly resistent to normal spills and scuffs. Soap and lukewarm water or a mild, non-abrasve cleaner are reccomended. Aoid use of abrasive pads and scouring powders which can dull the surface and make it more stain prone....." I suspect if this type of countertop is scratched you may be out of luck.
In some units I believe they use what they call a solid surface composite countertop. For those Keystone says, " The solid surface composite countertops can be cleaned with soap and mild detergents which will remove most stains. DO NOTuse products containing bleach. Stubborn stains may require the use of a white Scotch Brite pad and a non-abrasive cleaner like Soft Scrub. Scratches may be removed carefully using a green Scotch Brite pad and an abrasive cleaner like AJAX or Comet. Cover an area large enough to blend the area needing repair using a circular motion while applying. Most defects in solid surface countertips can be repaired without replacement."
Sounds like once Keystone tells you which of the two types of countertops were installed in your unit, you will have a 50/50 shot at removing the scratches. Hope this helps and that you end up with a positive result without having to replace those countertops.
Lt. AJD