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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '172dd09b98dffa128ffe666f8ecc02a8bf0eeabac8d238b1686fc6915fc6738d' 
  AND token = 'CyxY/ZtQ5PnBkTfSZVxbD/vL4Ih1OrD3nsEfUQihdsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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