The explorers pack is a reward given to those that pre-ordered the game. there is a known issue where players on consoles get their rewards with a (significant) delay. If you are unsure if you are entitled for this pre-order bonus and want to verify if you are suffering from this bug I advice you to contact support.

If you didn't pre-order then unfortunally you are not entitled for this reward and you need to buy the adventurer pack to get the same benefits (but a different miniature)

As @Ranique explained, this was a pre-release promotion that ZOS ceased selling the day ESO launched. Any codes people obtained after that day are simply boxed product already in the 'channel' and being sold 'while stocks last'.

I don't recall if the EP applied to console pre-orders or not, but would assume so if pre-orders were possible, but any game purchase from ZOS since launch day 2014 will not qualify.

So yes, @InsomniacOlympics you're right, you'll have to buy the AP as a substitute for the perks EP provided, particularly the 'any race, any faction' feature that you're looking for.