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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d4950120f6784ffbe288c33ea490b6539994918744d590657faa439514308b8' 
  AND token = 'pFed4RU3cdLwXl7A3UILw3kfUKc9pYwKbX7c6st6vJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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