SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '158ea9398e6da29058a44eb4f19416e6ae6ff38242666610d67ea5c7c7cb8956' 
  AND token = 'ZJOYn7BlrqwqdxWS+lqXxx+5BZ8yKWRKSch/O8XlKZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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