SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc8a05c68f53b93b7243465bb8338588e81b6f7bac61673d6ce70b14a992a903' 
  AND token = 'wX4EsnKGBDdmbKjBzGh/pnyQmJr52P/zuTIGmDkE3xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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