SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bb7df8ccb5ab68ed261af39f1587f91ae437439281569582d043aeab6313225' 
  AND token = 'KtXl4TGzt1E7Ozw/MYSyrAQnURTXHd/BSrE5ARBcvO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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