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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4ef8a6d14ec20800d7758c0031dc6cde709ffa3cbd9069f461fdc548eb8ab0f' 
  AND token = 'Hr2O2yf2QwDWxUD+xxPakXEM9/P8uHZIkGOQe5ENMN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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