SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc29768f8c2d493ddfb8b47afe851c54c55654294042740fda59311f401e8ee0' 
  AND token = 'fXLOsP8DGgXRLvAxEQb6buBo7l8XNXqjpxPNT+PmPEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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