SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e69490ba262ed693029389bd61a6b0353671c359577348f2d89fc849b150b6a' 
  AND token = 'WS4hZU6h0RTs3U6wJh5lulviwArNqsn1BWURnxjxWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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