FREE: Call Of Duty: Black Ops III - 1000 (+100 Bonus) Call Of Duty Points - PS4 [Digital Code]

Short Answer - 165 Cryptokeys (Approx.)
-----------------------------------------------------------
Long Answer - Full description :

So if you go to the official call of duty website you find that -
10 CRYPTOKEYS you get A COMMON SUPPLY DROP
30 CRYPTOKEYS, you get A RARE SUPPLY DROP

Do Call of Duty (COD) Points replace the Cryptokeys or Dr. Monty’s Factory Vials that are earned in game?
No, Cryptokeys are still earned by simply playing Multiplayer and Factory Vials are earned by playing Zombies. COD Points (CP) are optional.

HOW MUCH DO IN-GAME ITEMS COST IN CP?
Rare Supply Drops – A rare supply drop costs 200 CP
Vials – 3 Vials costs 200 CP
Extra Slots – Costs 300 CP

So since a rare supply drop cost 200 CP or 30 Cryptokeys, approx 1100 call of duty points are equivalent to 165 Cryptokeys.

As explained above COD are not linked to cryptokeys and therefore cannot be exchanged from one currency to another. Hope this answers your question.

Reference :
https://support.activision.com/articles/en_US/FAQ/COD-Points-in-Call-of-Duty-Black-Ops-III

https://www.callofduty.com/blackops3/black-market