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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77088dfb5be1de7f1699aa9295e6101217de6a74fd05404b915cc1a2fe4b485f' 
  AND token = '1cofj6et8VNTaKiw7V7bDI5W7TtauQHqQBw7PdY/YQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}