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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a36bf520dc00a5dd4eb04b0b7c04a03f6d723b30331fe037035f13f152817b5' 
  AND token = 'odnPnEXWi7qjiOLtQMFiwbesxPffZ0UAe1QOyrJ6Zfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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