SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '929557737ac1ae1a532c4fda6b9b809cb21b163c7137a206df8618c7c59bbb80' 
  AND token = 'qjfzeYqV7EY+3yV1wrTXUBFlxCDCVNUnjJD4/zo+jms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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