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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ffdab970e6edcd9d5ad056ccb6898906384b1b07a1285b3e9c35c6f6b1f2eb5' 
  AND token = '47on5oXWOogmXTFyE+ohkrCFSW31++8EywbumYWquoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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