Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d7a3cbbc76d1b7512f6135fdc4d8356ade56042ae609799642784b5bb476aa9' 
  AND token = 'RXNbWIVsROwwtT38RM9682FHmU5P01bhq6M/FDWyseU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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