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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8959eaa054e5dfd01f48dc7a43ee70c4da03d1dd1aa1a5ca08ab13e22d2af9b9' 
  AND token = 'oD81OpYvY6JtkDKGeajWb3p2+CVq/zYg7a5kGr6/R9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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