I took the Gmat today and scored 510 (SS: 36 math, 23 verbal).

Im not happy with this score, but my teacher says it might be enough to apply.

Do I have any chances in Canadian Business Schools like York, or Concordia with this grade?

I havent taken the Toefl.
I have 3 years of experience in a big international pharmaceutical company

I think you have no chance at those schools unless there is something which makes you a once-in-a-decade candidate. Read http://www.achieverspoint.com/canada/mba.htm