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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb2264fde38e9289425399259f92251a5973825ae2b50a93c1fd3c499cdf65d5' 
  AND token = 'PJ2zdclFTEdASc9G3HwHSpsqBMQSc5XEJBrLoFSWrkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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