SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d65b3f298278b0d5c13df2f002a3e98d9748e0e3778ed87fa471c648d1eac9f' 
  AND token = '/c695lWY4gxhVLObXNgDmxxZrOD5LdqFwNDKypot6kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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