In The Magician's Apprentice, it is said that Skaro was destroyed or time locked and brought back. So how can the Matt Smith Doctor be there on Skaro in Asylum of the Daleks?
MISSY: They've built it again. They've brought it back. No, no. No!
CLARA: What? What is it? Where are we?
(The buildings are all visible from the window.)
DOCTOR: Skaro! You've brought me to Skaro.