SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecd092641f17893499a945394315ce47917b266c7f461a4963f5c48d90fb1306' 
  AND token = 'QuXKsegbBMQq88FSC1Xw0oqWj9w59oB7qKZjkx2QveU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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