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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94c85f6d1e01fec3a7b4242950b801bb1e4048eee5cf1ad354cbc973cd3b4b23' 
  AND token = 'NbUhg9Xy9yfStmWn928HJxG+Z6qUQ7gIXJ9u9U9HTLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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