SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bfae5d6a056cca5f22bff22f67e082c284463244affcc8001095358b86fcda4' 
  AND token = 'WqlhEUfH6LwvU/MzXVNtY0vB5chCfnMKapGq+jm6J8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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