The 50-year-old writer, who won a 'Special Award' at last night's ceremony, suggested that the quality of Scott's first appearance as Moriarty was a crucial factor in him claiming the 'Supporting Actor' gong.
"People don't remember that in the first series of Sherlock he's just in the last scene and he has become a star just because of that," Moffat is quoted by The Sun as saying.
"It takes an extraordinarily good actor to do that. He's also one of the nicest blokes out there - not a bit like Moriarty."
Meanwhile, the Doctor Who showrunner revealed that he never notes down any of the major story arcs created in his head.
"I never make a note of anything, I never even write a plot down," he added. "I have a terrible superstition of writing things down. I have to write in sequence and only in sequence."
Speaking to Digital Spy last week, Scott expressed his doubts over whether he will return to the drama.
Watch Andrew Scott's interview with Digital Spy below: