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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473273a06375c842c4999d36e575992c6cef7f7af07af3e9eb976fa8022c76b1' 
  AND token = '0T0eRo3kjw7mQ292IQdeRX5RxDRwJIo5q9/zuwY9o0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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