SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd41328466f984eb94cf27b614af1cba9b989ba4429df4ec03e77253fbe38c4e1' 
  AND token = 'CXOYY9bhNQ9ZFjjxUe+4TvxBeMi/R3/hxq7wr6t00FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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