Yes, KEYPAD is a Scrabble word!

Letter values in Scrabble US: K 5, E 1, Y 4, P 3, A 1, D 2.

Is it a valid word?

KEYPAD is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a keyboard that is a data input device for computers; arrangement of keys is modelled after the typewriter keyboard

Also: computer keyboard.