(repost from comment to close the thread)
I've found the answer, thanks to Calinou for pointing Filter as the parameter to find, so for people looking for it:
Go into your Material inspector, in Emission click on the Texture > Flags and uncheck Filter.
I wish there was an option in the Import tab like Calinou said but I never got it, even when I click on the Material to reimport it (it remains blank)