SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bdc40b86c0593b7e752a46f365faeba76cefdcfafa3383d61c5312f47def83b' 
  AND token = 'zu6CsksBzTdf4GmCOX/j65Zk4YgSANIlXqvrd+9oXOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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