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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b3d5e74fd726938eaa8be20f73f69da78e769674cd1c58064006c6c9a51647' 
  AND token = 'xdnXP9y0ewqtWNWbxc65IExiQb6hSp8f1YY4eXLPwlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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