SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40efd551f4198f87f64cf955f32d9a5c59eb4080571a7b5402c169da80f216c9' 
  AND token = 'jjsOzpiqFlLgv1UkWIoSUWNP45hmUscZpSgmRFoSPdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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