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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50b883f8eb76cc9b8e1fd32cdf0c6c6dafb2a586a35c7bc08d1a43d3b4ed00b1' 
  AND token = 'Qji3j9NquIcpTnQPzuy4lLf1hZQ1iIhKhP9elx+vGG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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