SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d9c6d28f7ddb7150241452b24c84378c32d0ab8ad6ea7fcac1884e1880fa24e' 
  AND token = 'x2CRXv7OpkTun+skt7+u+w/P8iGUTnky2VJg/LSQhow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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