SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35a9778fd9a46c49dad8fb82b7ed1cf0a75341683acfa27c439777219edb4cb8' 
  AND token = 'QIEvsie+QSSFqs8iYLYw3GDVALJG7Ab+g0etp1NDZPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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