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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b066b50d05d958f0dff901ea7ee6fef28256d947449dadcd556c74ea2cc73fb' 
  AND token = 'hE3oAHA5UmagklyqP9DuS0fr0mLqySWbDlln0yIva7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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