Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '403f1bc2b2f00b57abe0891b0d4aa5ea4b5150fc88c8f75d4108561644613c56' 
  AND token = 'WU+34QPIgKH5+JOb2K6xsrykIdW/pWrVaVC4jtbNSek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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