SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1faa4b18759ee72e0d15ec04185b8a44b8e552293680894679395e570a7893dd' 
  AND token = 'KQX99eoSzPslxi/JUhCIO7MK1w+EHYGZtv9QXBgAdBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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