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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2bc5eed7d6058fd82f0dd2f72b3d53124359ac127c754dbcc49c389d432152c' 
  AND token = '2SLV9P72b/07TxeEwteYNG9TsiquScGGcmiPcTCVKFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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