SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df2a8af2ceb6c3b22870a268f42260d7aef557b780166e79aef4f975de41a43d' 
  AND token = 'Y57FGqRrrjoFeDoEfXVmHjW2CsCYJNBBJtgIK8ZRekA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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