SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbc43830e43a9b06a01189cdc5741ad9fa14d5df7b8a17b66dd6384d3c193c50' 
  AND token = '48nTW0PMYmf+1WOKhXjsYRUJ4VIesC+w67EsZZBg/JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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