SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a64be63d3619d75376a9e517640fcf93c7cd29bb79c0a03046382c9b69aba5dc' 
  AND token = 'yJNHax2B4cwHApdh+wGEs+fjaogkOnTPCCkrp8Vq7gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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