SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c7ebc2048f067b69f67514648296826307d3dbbf51adb86f330683b1401752' 
  AND token = 'KyzJyWzUMAEnmcUNJY7zZCAyUux2J1G1JuzUNpVfv+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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