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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50364d082b7e3ab60fd0cb1bacafc66510d32e3c535ad98657ee5bce6a61658b' 
  AND token = 'ZAJie+eI+laZADrnNztC5Hvh7HwgfLf8CiwdzJKFvls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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