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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '882e28695ffffc39c66f0b9157b346cc687fd05b7b5fb51c894c42abf5bdd7e3' 
  AND token = 'EDzVI09qt6qelQ6NsbQrUhGDArrYMXAwkz7ReYLcfic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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