Smells fine, no mold, then probably fine.

http://www.latimes.com/food/dailydish/la-dd-10-foods-safe-eat-past-expiration-date-20140318-story.html
Little something I just read on alan aragons page

honestly to get all protein nutrients since its expired i would not mix with milk or water. i recommend just snorting that shit or to inhale it.

it's fine but there's no need for protein powder, it's just junk sold by a multi-billion dollar marketing industry.