SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ce36db400c4a006b7227478514264ebf88a0a952d7657f776aa9b57027210b4' 
  AND token = 'J1ga3VuwgpTF1XYl20KqhBFgd6uScBS2xzk1nP0MwV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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