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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '179c89f80babb745ca75ed30317bf7d84c8fc11e05ef6eb89687cb5f86ac7874' 
  AND token = 'k1UgODZy0LtKhLlRwDx17HXuudEtHHwUOSviUuw6h/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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