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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ba292a7102ad4e73ddee8cd3101949f3394e6811b7fbd24720ea68e7da6bbed' 
  AND token = '4NXBSair+7LVXirj7rffl3BV9nUQm20V+WlF7hwXuxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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