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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '670aac85a409574041cf312184c0cd4092d50cef10c0d32951b4b4e5d186f51a' 
  AND token = 'H5Sneb5S5cPg8xTk3fLIrGkrxme3JNZCFTa4N4lyWoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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