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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2989ee36c422f95c26020bf1a96f53552d7d112ccfecd38910f96ba7eb5ced08' 
  AND token = 'mPFmzP5GXWyceiEcbVjAzEOS7LblQNz2bLWUz6LTw78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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