SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa6b8a75e860efbab6996017ba31444a3ae30fa51da6822c1b886390f8097192' 
  AND token = '/huj2iYw7BhZx1M+hJw/zH1FvjscPzsUyMlc3KW3pgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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