SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92e9c90f46684819b0829c62e6093f7db7769c1cb8011301fd6c6e57bbfb9e38' 
  AND token = 'hxu64uPBhZ0V1uJp/53wulHQEsriR8WRI+ccKMT+iwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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