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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3949f994c0ca44752af7894e740ff39fffef144248e1fe1728e2baa6fd771865' 
  AND token = 'ZBn+ZZyvQs/qyRT5jq0xwjlZ0T48vcW8DvatVqjXD2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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