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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '544139ca74a3610d27737cabf5ead83e23d3aa77c3ed7a3bd9ccd922a8d43079' 
  AND token = '1CJ6AlvBMwHZU98DL8zVr5n9kZw95QRzREcjBsyAn/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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