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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3763269b84c14a9b91bbfd487902d95e3cf160b0c87cd1d62a3fd873457bc661' 
  AND token = 'aa1+Od5pU9lNQFMPDlFXxRzmf92RSNvuUqt91lN+ufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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