SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfed2a53f0ad6c73d9d9c414c7a839cfb3b39a5af5b8759b8fdda6c9ca19bf2d' 
  AND token = 'wEB3zP1cZSBnZVGst0HCQDtl1Ll9TW+vKrx0PDVNwFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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