It happened in the Cloughfern Corner area of Newtownabbey on Monday night.
Detective Sergeant Philip McCullagh of Newtownabbey CID said: “At approximately 11.45pm it was reported that two men carrying knives entered a fast food outlet and threatened staff before making off with a sum of cash from the cash register.
“Police stopped a car a short time later in the King’s Road area and arrested the men. They remain in custody assisting police with their inquiries.”
Police have appealed to anyone with information about the robbery to contact detectives at Newtownabbey CID on the non-emergency number, 101, or to call Crimestoppers and speak to them anonymously on 0800 555 111.