SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43bc85a2078656b88a363b6285951bf6f18bfc0fef897f6c8bb174016ef0d8d0' 
  AND token = 'Xq8zplDGmHpag5SkMkZV7FX11G6GuP4zgJZ5xtuJL9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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