SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '045cc156c59325c9fe006fc460f1a6053dc3b19b6478c169f64fc4fbe8018ff0' 
  AND token = 'vBZJc65qgq7RJVZPjZRqvyr9W/NXyku2IyFDhkvGxtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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