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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3cdc232813cb10aded60a22f26b2894f1ec7e7aed81cab86d5c04e6ec20afb7' 
  AND token = 'ISd2j3CZjJY7f6lBaHOLgKRPUoo7sfpojWFVIo6szYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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