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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e35c5828eef2b1e76702a8c8a81b64f74f17f6d7de46d189bd961ee018854db1' 
  AND token = 'rEEcSr8Fqsmr5xydvWuvSzo2EJQV9b8rtwi5/Hn/E9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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