SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb300769c8fc49407e73d40012d814c91514dbb158527332a07f02bdf0ecdb91' 
  AND token = '6zHDoj6p9DbpxpOF1/YZYls3PqaK3Dh3nVWNTWL6wmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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