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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e9f42b3c825042368742ebf7ce8a9c593ed12fbe5faf04425ec854ffb0db434' 
  AND token = 'rHSR1PDvQe2d4vZmIrQ5ndQW0Pp4uw1AGXI6O9/i/18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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